just to clarify, when you say it cant install do you mean you cant install it on your phone, or Unreal cant package the project and make the apk? Im not entireley sure which sdk/ndk you need specifically for ETC1, but i can see from the image that youre using a different version from me, also dont bother updating codeworks, the newest version is too advanced for unreal, if anything try uninstalling it and delete the NVPACK folder and try reinstalling it , But make sure you install 1R7 instead of the newest one
im pretty sure the gradle errors mean that your computer couldnt communicate with your phone, however, i dont think that matters because yo if you follow my instructions, it should treat your phone as a usb drive in fact, you can unplug your phone during the packaging process. the gradle drivers should be installed on your computer when you install codeworks, but again for this particular process i dont think you need them.